Android06_Android中常用控件

一、Android的常用控件

Android常用的控件有TextView、EditText、Button、Menu，下面将使用一个乘法计算器的例子来说明这几种常用控件的使用。

二、计算器功能界面

1.计算界面

2.输入界面

3.结果界面

三、代码

1.目录结构：

2.代码

Activity03.java

package com.android.activity;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;public class Activity03 extends Activity {private EditText factorOne = null;  //被乘数private TextView symbol = null;     //符号private EditText factorTwo = null;  //乘数private Button calculate = null;      //计算按钮@Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                factorOne = (EditText)findViewById(R.id.factorOne);        factorTwo = (EditText)findViewById(R.id.factorTwo);        symbol = (TextView)findViewById(R.id.symbol);        calculate = (Button)findViewById(R.id.calculate);                symbol.setText(R.string.symbol);        calculate.setText(R.string.calculate);                calculate.setOnClickListener(new MyButtonListener());    }@Overridepublic boolean onCreateOptionsMenu(Menu menu) {menu.add(0,1,1,R.string.exit);menu.add(0,2,2,R.string.about);return super.onCreateOptionsMenu(menu);}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {if(item.getItemId() == 1){finish();}return super.onOptionsItemSelected(item);}class MyButtonListener implements OnClickListener{public void onClick(View v) {String factorOneStr = factorOne.getText().toString();String factorTwoStr = factorTwo.getText().toString();Intent intent = new Intent();intent.putExtra("one", factorOneStr);intent.putExtra("two", factorTwoStr);intent.setClass(Activity03.this, ResultActivity.class);Activity03.this.startActivity(intent);}}}

main.xml——Activity03布局文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><EditText android:id="@+id/factorOne"android:layout_width="fill_parent"     android:layout_height="wrap_content" /><TextView  android:id="@+id/symbol"    android:layout_width="fill_parent"     android:layout_height="wrap_content"     /><EditText android:id="@+id/factorTwo"android:layout_width="fill_parent"     android:layout_height="wrap_content" /><Button android:id="@+id/calculate"android:layout_width="fill_parent"     android:layout_height="wrap_content" /></LinearLayout>

string.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="hello">Hello World, Activity03!</string>    <string name="app_name">Activity测试03</string>    <string name="symbol">乘以</string>    <string name="calculate">计算</string>    <string name="result">结果</string>    <string name="exit">退出</string>    <string name="about">关于</string></resources>

ResultActivity.java——结果显示

package com.android.activity;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.widget.TextView;public class ResultActivity extends Activity{private TextView resultText = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.result);Intent intent = getIntent();String factorOne = intent.getStringExtra("one");String factorTwo = intent.getStringExtra("two");int resultTemp = Integer.parseInt(factorOne)*Integer.parseInt(factorTwo);System.out.println("-----dfss--------"+resultTemp);String result = resultTemp+"";resultText = (TextView)findViewById(R.id.result);resultText.setText(result);}}

result.xml——ResultActivity布局文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><TextView  android:id="@+id/result"    android:layout_width="fill_parent"     android:layout_height="wrap_content"     /></LinearLayout>

完成！

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